@InProceedings{BarbosaCava:2012:InAlVo,
               author = "Barbosa, Tatiane Felinto and Cavalcanti, Iracema Fonseca de 
                         Albuquerque",
          affiliation = "INMET and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Intrus{\~a}o de Alta Vorticidade Potencial sobre o Oceano 
                         Atl{\^a}ntico Sul no Modelo de Circula{\c{c}}{\~a}o Geral do 
                         CPTEC",
            booktitle = "Anais...",
                 year = "2012",
         organization = "Congresso Brasileiro de Meteorologia, 17. (CBMET).",
             keywords = "vorticidade potencial, MCGA CPTEC.",
             abstract = "Neste estudo foram analisados os padr{\~o}es de alta vorticidade 
                         potencial (AVP) no n{\'{\i}}vel isentr{\'o}pico de 350 K (~200 
                         hPa) sobre o Oceano Atl{\^a}ntico Sul (OAS), no per{\'{\i}}odo 
                         de ver{\~a}o entre 1979-2001. As rean{\'a}lises ERA-40 foram 
                         utilizadas na an{\'a}lise observacional enquanto que tr{\^e}s 
                         simula{\c{c}}{\~o}es com o Modelo de Circula{\c{c}}{\~a}o 
                         Geral (MCGA) do CPTEC foram utilizadas para an{\'a}lise das 
                         caracter{\'{\i}}sticas representadas pelo modelo. Na 
                         identifica{\c{c}}{\~a}o dos padr{\~o}es de AVP considerou-se a 
                         incurs{\~a}o da VP em 350 K de -1,5 UVP atingindo a latitude de 
                         10°S. O m{\'e}todo de Fun{\c{c}}{\~o}es Ortogonais 
                         Emp{\'{\i}}ricas foi aplicado no campo de VP nestes dias para 
                         determinar os padr{\~o}es de AVP sobre o OAS tropical e apenas a 
                         primeira componente (CP1) foi analisada. A CP1 apresentou um 
                         padr{\~a}o de intrus{\~a}o de AVP com orienta{\c{c}}{\~a}o 
                         norte-sul sobre o OAS tropical pr{\'o}ximo ao Nordeste do Brasil. 
                         O n{\'u}mero de eventos identificados no MCGA correspondeu {\`a} 
                         metade do visto na observa{\c{c}}{\~a}o. A import{\^a}ncia dos 
                         ventos em altos n{\'{\i}}veis na regi{\~a}o equatorial e nas 
                         latitudes m{\'e}dias do OAS {\'e} ressaltada nessa 
                         compara{\c{c}}{\~a}o, pois o vento zonal da regi{\~a}o 
                         equatorial foi climatologicamente mais fraco e a corrente de jato 
                         mais intensa nos resultados do modelo. A variabilidade interanual 
                         dos eventos identificados na CP1 foi associada ao fen{\^o}meno 
                         ENOS. ABSTRACT: Analysis of high potential vorticity (high-PV) 
                         patterns in the 350 K isentropic level over the South Atlantic 
                         Ocean (SAO) was performed in the summer season during 1979-2001. 
                         The ERA-40 reanalysis was used for the observational analysis and 
                         three simulations with the CPTEC Atmospheric General Circulation 
                         Model (AGCM) were analyzed to verify the model ability in 
                         representing the observed features. The high-PV cases were 
                         obtained from incursions of PV of -1.5 UVP at 350 K reaching the 
                         10°S latitude. The Empirical Orthogonal Function (EOF) method was 
                         applied in the field of potential vorticity (PV) of the selected 
                         days to determine patterns of high-PV on the tropical OAS. The 
                         first mode (CP1) showed a pattern of high-PV intrusion with 
                         north-south orientation over the OAS, near the tropical 
                         northeastern Brazil. The events identified in the AGCM correspond 
                         to half of the observed. The importance of high level winds in the 
                         equatorial and middle latitudes of the SAO are emphasized in this 
                         comparison, because the equatorial zonal wind was climatologically 
                         weaker and jet stream stronger in the model results. The 
                         interannual variability of the events identified in CP1 were 
                         associated with ENSO.",
  conference-location = "Gramado, RS",
      conference-year = "2012",
                label = "lattes: 6731029375224939 2 BarbosaCavaRao:2012:InAlVo",
             language = "pt",
           targetfile = "64KR.pdf",
        urlaccessdate = "30 abr. 2024"
}